/*******************************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package org.apache.nutch.scoring;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.nutch.util.Bytes;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableUtils;

public class ScoreDatum implements Writable {

	private float score;
	private String url;
	private String anchor;
	private int distance;
	private Map<String, byte[]> metaData = new HashMap<String, byte[]>();

	public ScoreDatum() {
	}

	public ScoreDatum(float score, String url, String anchor, int depth) {
		this.score = score;
		this.url = url;
		this.anchor = anchor;
		this.distance = depth;
	}

	@Override
	public void readFields(DataInput in) throws IOException {
		score = in.readFloat();
		url = Text.readString(in);
		anchor = Text.readString(in);
		distance = WritableUtils.readVInt(in);
		metaData.clear();

		int size = WritableUtils.readVInt(in);
		for (int i = 0; i < size; i++) {
			String key = Text.readString(in);
			byte[] value = Bytes.readByteArray(in);
			metaData.put(key, value);
		}
	}

	@Override
	public void write(DataOutput out) throws IOException {
		out.writeFloat(score);
		Text.writeString(out, url);
		Text.writeString(out, anchor);
		WritableUtils.writeVInt(out, distance);

		WritableUtils.writeVInt(out, metaData.size());
		for (Entry<String, byte[]> e : metaData.entrySet()) {
			Text.writeString(out, e.getKey());
			Bytes.writeByteArray(out, e.getValue());
		}
	}

	public byte[] getMeta(String key) {
		return metaData.get(key);
	}

	public void setMeta(String key, byte[] value) {
		metaData.put(key, value);
	}

	public byte[] deleteMeta(String key) {
		return metaData.remove(key);
	}

	public float getScore() {
		return score;
	}

	public void setScore(float score) {
		this.score = score;
	}

	public String getUrl() {
		return url;
	}

	public void setUrl(String url) {
		this.url = url;
	}

	public String getAnchor() {
		return anchor;
	}

	public int getDistance() {
		return distance;
	}

	@Override
	public String toString() {
		return "ScoreDatum [score=" + score + ", url=" + url + ", anchor="
				+ anchor + ", distance=" + distance + ", metaData=" + metaData
				+ "]";
	}

}
